Sneak Peek: Grey's Anatomy's Big November Sweeps Guest Star

Have you noticed your favorite TV shows have turned it up a notch lately? Well, just look at your calendar. Right about the time we turn our clocks back, TV springs forward with gimmicks (hello, Skating with the Stars!) and guest stars galore to win that all-important ratings period called November sweeps. Advertisers will be crunching the numbers while you clog your DVR with some of the most hotly anticipated episodes of the season.

Another reason to tune in this November? The opportunity to rediscover stars who've been keeping a low profile of late.